Rotary pump.



J. LEHNB.

ROTARY PUMP.

APPLICATION FILED 11111.11, 1912.

1,038,769. Patented Sept. 17, 1912.

2 SHEETS-SHEET 1.

J. LEHNE. 1

ROTARY PUMP.

APPLICATION FILED 11111.11. 1912.

1,038,769. Patented sept. 17,1912.

2 SHEETS-SHEET 2.

ULL

JOSEF LEIEINE, 0F CHARLOTTENBUBG, GERMANY, ASSIGNOR TO INTERNATIONALE ROTATIONS-MASGHINEN-GESELLSGHAFT M. B. H., 0F BERLIN, GERMANY.

no'rAnv ruim.4

Specification of Letters Patent.

Patented Sept. 1'?, 1912.

Application mea January 11, 191e. serial no. 670,625.

To all whom t may concern Be it known that I, JOSEF LEHNE, a subi ject of the Grand Duke of Hesse, residing at l Charlottenburg, Germany, have invented certain new and useful Improvements in Rotary Pumps; and I do hereby declarethe i following to be a full, clear, and exact del scription of the invention, such as will enl able others skilled in the art to' which it appertains to make and use the same.

In rotary pumps in which a vane or cellular wheel coperates with a workin andl jointing liquid ring produced by centrifugal force in a surrounding stationary chamber under the influence of the rotating cellular wheel, a great loss of energy results and the fluid heats greatly on accountof the v high frictional resistance of the liquid ring on the walls of the stationary chamber. According to the present invention these troubles are avoided, by a freely rotatable drum being provided" to receive the working liquidwhich drum is revolved by the friction of the liquid, so that the liquid frition is replaced by .the much smaller bearing friction of the drum.

A further object of the invention consists in providing, in combinationwith such arrangement, controlling means acting satisfactorily even. at-high speeds. In order to' full this object the cellular wheel is made of a bell shape and the passages in the sev? eral cells, serving for the admission and the outlet of the Huid to be conveyed, are controlled by means of a centrally arranged controlling member.

In the accompanying drawings several constructional forms -of the invention are exemplified.

Figures 1 and 2 show the one constructional form in longitudinal and cross section respectively. Figs. 3 and 4 show two further constructional forms .in longitudinal vertical sectionand in horizontal section re` spectively, and Figs. 5 and 6 are part sections through again other constructional formsf In Figs. 1 and 2 a is a rotary drum journaled on one side with its shaft b in a casing o in ball bearings d1, d, and intended to receive the working liquid. s

g is thebell sha` ed body of a cellular wheel fitted to the s aft f; vanes k attached to the same form together with side walls z', t' cells, which are quite open toward outside. In the bottoms of the cells formed by the hollow cylindrical rim part g1 of the wheel body are provided passageopenings 7c, whichv are intended as inlets and outlets for the iuid to be conveyed.

o is a stationary valve or controlling member, which contains 4passages m and n and besides serves as bearing for the shaft j. When the cellular wheel g isdriven, the liquid in the drum a will also receive a rotary motion by the action of the vanes of the wheel and will communicate this rotary motion by friction to the drum a. At a correspondingly high speed a liquid ring will be formed along the circumference of the wall of the drum. Thequantity of the liquid inclosed in the drum is preferably made so large, that the liquid ring will completely fill the cells at the point Where the distance between the drum a and the cellular Wheel is smallest, so that theair or the like fluid 1s as` completely as possible removed from the cells. On the other hand the dimensions may be so chosen, that on the side of the greatest distance the cells are still closed by the liquid rin If the cellu ar Wheel revolves in the direction indicated by the arrow, Fig. 2, the Huid to be conveyed will be sucked through the passage m connected with the suction pipe q, as on this side the volume of the cells not filled by the 'working liquid is increased, while the fluid is forced out through the passage n connected with the delivery Apipe g1, by being displaced by the liquid ymember o is ttedan eccentric ring Z, the

circumference of which is concentrically arbearings d1, d are arranged on ranged to the drum a. The gap j between this ring andthe correspondingly recessed face wall of the drum a can be closed by means of a packing ring s, which can be forced against the gap j by the -turning of a threaded ring t, whlch is providedwith a handle u projecting toward outside through a curved slot z in the casing c. The thread is preferably so arranged, that when the machine -is started, the packing will release itself.

'In the construction shown in Fi. 3 the iiferent sides of the drum a, the bearing d at the right hand being disposed eccentricallyaround the shaft f of the vane or cellular wheel g. In a similar manner this shaft fv is journaled in bearings at both ends. In this construction further the controlling;

member o has one passage only, for instance a suction passage, whlle the compressed j fluid has free passage to the casing c, being preferably conducted axially through the wheel g and through openings y in theright hand face wall of the drum a, so as to deposit l in the wheel, by the centrifugal-action, any particles of the working liquid which it may have carried along. The rotary drum a is tightly jointed against the stationary casing c and the stationa controlling member o by the labyrinth c amber` packings e and e1 respectively. The controllin member does not extend to the outside an the communication with the atmosphere or any other room from which the fluid is conducted to the pump, is obtained by openings r arranged around the bear-; ing d1 in the left hand face wall of the' drum a, so that the bearing d1 may be made of very small dimensions, compared with a construction where it would ,be arranged around a controlling member extendingl to the outside as in Fig. 1.

According to the construction of thecontrolling means shown in Fig. 4, the jointing surface of the. bell shaped wheel bodyfg is not of a hollow cylindrical form, but of a hollow spherical form. A disk u having spherically faced flanges, and revolving on an axis obliquely disposed to the main shaft divides the opening lof the cells lc into two groups, namely in to suction and into delivery openings. This disk u is carried along by the friction of the wheel body g, so that only an axial frictional componentis produced. In Fig. 4 the jointing between the drum and the casing is besides effected by means of a liquid ring at p communicating with the interior of the drum.

In Fig. 5 a constructional form of the4 Instead of a cellular wheel as shown in Flgs. 1-5, with cells closed by disks at the sides, a plain vane wheel g may be used according to Fig. 6, which may -be jointed wheel, a drum adapted to contain a working fluid mounted eccentrically about said wheel for free rotation independenti of the latter, and a controlling member slidably engaging said wheel for controlling such fluid passages.

2. In a rotary pump, the combination of a cellular wheel provided with fluid passages, means for positively driving said wheel, a drum adapted to contain a working fluid mounted eccentrically about saidl wheel for free rotation independent of the latter, and a stationary member for controlling said fluid passages. A

3. In a rotary pump,.the combination of a cellularwheel having a hollow hub provided with luid passages, means for positively driving said wheel, a drum adapted to contain a Working fluid mounted eccentrically about said wheel for free rotation inde endent of the latter, and a controlling mem er slidably engaging the inner surface of said hollow hub.

4. In a rotary pump, the combination of a 'cellular wheel having a -hollow hub provided with Huid passages, means for positively driving said wheel, a drum adapted to contain a working fluid mounted eccentrically about said wheel for free rotation inde endent f the latter, and a controlling mem er extendin in sliding engagement with a portionL o y ofthe inner periphery of said 'hollow'hu p v v 5. In a rotary pump', the combination of acellular wheel havin avhollow hub provided with a series of uid passages, means for positively driving said wheel, a drum adapted to contain a working fluidvmounted low hub for successively covermg such several fluid passages.

6; In a rotary pump,l the combination of a drive shaft, a cellular wheel secured theresaid hub and at least one of said side walls being provided with iuid passages, a drum adapted to contain a working fluid journaled at both ends eccentrically about said wheel for free rotation independent of thelatter, and a controlling member slidably en aging the inner surface of said hollow hui or controlling' such passages therein.

7. In a rotary pump, the combination of on and having a hollow hub and side walls, l

of said hollow hub, -the engaging ra cellular wheel having a hollow hub and side walls, said hub and at least one of said .side walls being provided with fluid pas# eccentrically about said'wheel for free ro-l tation independent of the latter, and a controlling member slidably engaging the inner surface of said hollow hub for controlling such passages therein. 8. In a rotary pump, the combination of a -cellular wheel having a hollow hub provided with l'luid tively drivin sai wheel, and a controlling member slida ly engaging the inner surface surfaces of said member and hub bemg o spherical form. y l f 9. In a rotary pump, the combination of assages, means for posi'- a cellular wheel having a hollow 'hub provided with aspherical surface on its inner periphery and having a series of iiuid passages, means for positively driving said wheel, adrum adapted to contain a working iuid mounted eccentrically about said wheel for free rotation independent of the latter,

and a rotatably mounted disk having its axis inclined to that of said wheel and provided with a spherical surface forengaging the corresponding spherical surface vof: said JosEF LEHNE.

hub to control'such Huid `passages in the Witnesses AUGUST TRAUTMANN, WOLDEMAR HAUPT. 

